Compared with crude petroleum, F-T synthetic crude oil mainly has paraffin and alkene, containing few cycloparaffin and arene, with extremely low sulfur and nitrogen.

同石油原油相比，F-T合成粗油品主要由链烷烃和链烯烃组成，环烷烃和芳烃含量很少，且具有硫、氮等含量少的优点。

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The environmental problems resulted from synthetic paints and solutions thereof are introduced. The features of environmental protection of crude vegetal paints and their applications are described.

介绍了合成化学油漆的环境危害及其解决措施；描述了天然植物油漆的环保特性及其应用。

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Objective to generalize the synthetic methods of phospholipid analogues and polymers and to review their applications to drugs based on crude phospholipids.

目的在简介磷脂的基础上，概括了磷脂类似物和磷脂聚合物的合成方法及其在医药领域中的应用。

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With the right technology, it can also be converted into a form of petroleum known as synthetic crude.

NEWYORKER: Unconventional Crude

It is estimated that there is enough bitumen in Alberta to yield 1.7 trillion barrels of synthetic crude.

NEWYORKER: Unconventional Crude

For every barrel of synthetic crude that Suncor eventually produces, forty-five hundred pounds of tar sands have to be dug up and separated.

NEWYORKER: Unconventional Crude